<form action="" method="get">
	<p><input type="text" name="s" id="s" value="Tìm kiếm" onfocus="if(this.value=='Tìm kiếm')this.value=''" onblur="if(this.value=='')this.value='Tìm kiếm'"/>
	<input type="submit" value="" id="send"/></p>
</form>